Pipe-wrench attachment for monkey-wrenches.



G. N. NELK.

PIPE WRENCH ATTACHMENT PoE MONKEY WEENGEES.

APPLICATION FILED NOV. 25. 1910.

1,077,964, Patented Nov. 4, 1913.

WIT/VESSES.' /N l/E/V TUR ATTORNEY UNiED srATEs PATENT oEEicE.

CARL NICHOLAS NELK, OF PALO ALTO, CALIFORNIA.

lPIPE-WRENCH ATTACHMENT FOR FIONKEY-VRENCHES.

To all whom t may concern Be it known that I, CARL NICHOLAS NELK, a citizen of the United States of America, residing in the town of Palo Alto, inthe county of Santa Clara and State of California, have invented certain new and useful improvements in Pipe-Wrench Attach-v ments for Monkey-Wrenches, of which the following is a specification.

My invention relates to attachments for monkey wrenches and especially to attachments designed for adapting monkey wrenches to turn pipes; and it has for its object to provide an improved attachment for the purpose, which may be readily attached to monkey wrenches of various sizes, which shall grip a pipe with great force, which shall throw the stress of operation on the strongest parts of the wrench, and which shall obviate slipping.

accomplish my objects by the means illustrated in the accompanying drawing, of which- Figure 1 is a perspective view of a monkey wrench showing my attachment in operative position; Fig. 2 a front elevation of my attachment; and Fig. 3 a side elevation thereof.

rlhe same numeral of reference marks the same part throughout the various views.

My attachment is made substantially in the shape shown. It comprises a block having a face 1 hereinafter called the front, a face 2 hereinafter called the back, a face 3 hereinafter called the bottom and two side faces. A portion 4 is cut out to enable the attachment to be attached about the shank of a monkey wrench forming two legs through which holes for sustaining pins are provided and a split pin 5 holds my device loosely in place. By the described means,

' my device may be readily attached to monkey wrenches and as the attachment need not be rigid, it may be made to wrenches of various sizes. However, to increase the range of variation in size, addi- Specification of Letters Patent.

Fatented Nov. 4, 1913.

i Application filed November 25, 1910. Serial No. 594,150.

The front face 1 forms an inclined plane with the back face 2, the angle of inclination being preferably about twelve degrees. The front face 1 is provided with teeth 10, theedges being inclined in the direction of the bottom face 3 produced, For the further purpose of obviating slipping, the teeth 10 are given an inclination with the side faces, as shown in Fig. 2.

The operation of my device is as follows: It is attached to a monkey wrench, as in Fig. 1, and the pipe inserted between the face l and the face 11 of the wrench. The jaws formed by the face 11 and the face l are thereupon tightened against the pipe, the spring 14 enabling this to be done without at first causing a iirm engagement between the face 2 and the face 13 of the wrench. The handle 12 is pressed downwardly and the teeth 10 grip the pipe. The strongest pressure is borne by the face 13 of the wrench, against which face 2 of my attachment presses, and the grip increases as the turning pressure increases, because my attachment tends to slip inwardly along the face 13, tending to bring more and more divergent portions of the inclined plane into operation along with the increase of pressure, thus creating three bearing points on the pipe; to wit: the teeth, the opposite jaw of the wrench and the lower face of the shank. I cannot accomplish the like results by reversing the direction of the inclined plane, as, for instance, by inverting my device and attaching through points nearer the base, for such an arrangement would tend to throw the greater pressure against the face 11 and on the weaker block 14. rlhe teeth engage the pipe when the handle is moved in the direction of the arrow. but the wrench moves freely when the handle is turned in the opposite direction. But the teeth are maintained in contact with the pipe during the movement of the handle in the opposite direction, by means of the spring 14C, which engages the face 13 of the wrench, my attachment slipping outwardly on each reversed movement of the handle, and inwardly on veach direct movement thereof,

by Letters Patent of the United* States of cated at a point which leaves a. space be- Amerioe, modicetion within the. scope of the claim being especially reserved, is:v

A pipe wrench attachment Vfor monkey wrenches comprising ar block having a out out portion forming two legs adapted to engage the sides of a. monkey wrench shank, and having a back face provided with a chamber, a. spring in and extending from said chamber, a front face inclined toward' f the top of said back face having teeth7 and Y a pin passing throughl holes in said legs lotween the bottom of said ont out portion and the bottom of said shank.

In testimony whereof, I have hereunto signed Vmy neme, in the presence of two witnesses, at Palo Alto, in the county of Santa Clara and State of' California', this y 19th dey of November,V in the year 1910.

CARL NICHGLAS NELK. Wtnessesi W. J. SHELDON, EDWARD C. H ARKINS.

Copies of this patent. may be. obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

